CN109373398A - A kind of kitchen ventilator exhaust nozzle pipe with noise interference device - Google Patents
A kind of kitchen ventilator exhaust nozzle pipe with noise interference device Download PDFInfo
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- CN109373398A CN109373398A CN201811420934.5A CN201811420934A CN109373398A CN 109373398 A CN109373398 A CN 109373398A CN 201811420934 A CN201811420934 A CN 201811420934A CN 109373398 A CN109373398 A CN 109373398A
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- 230000009467 reduction Effects 0.000 claims abstract description 39
- 238000001914 filtration Methods 0.000 claims description 28
- 229920000742 Cotton Polymers 0.000 claims description 11
- 229910003460 diamond Inorganic materials 0.000 claims description 9
- 239000010432 diamond Substances 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 16
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000000644 propagated effect Effects 0.000 description 5
- 230000007812 deficiency Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008451 emotion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Duct Arrangements (AREA)
Abstract
A kind of kitchen ventilator exhaust nozzle pipe with noise interference device, is provided with the exhaust nozzle pipe main body for connecting blower and exhaust pipe and the noise interference device for reducing multi-frequency noise, and noise interference device is assemblied in exhaust nozzle pipe main body.The noise interference device is provided with the first aperture and the second aperture, and the first aperture and the second aperture are connected to the air duct of exhaust nozzle pipe main body respectively, and the first aperture is different with the horizontal position of the second aperture.The kitchen ventilator is able to maintain long-term good noise reduction effect, which has the advantages that low cost, reliability are high.The noise interference device is that the noise that transmits interferes and reaches the noise reduction of specific multi-frequency noise to lower the amplitude of this noise frequency and reduced in resonance amplitude and phase, with wind channel tube through specific noise frequency.The material of the noise interference device is anticorrosive, resist chemical and is hardly damaged.
Description
Technical field
The present invention relates to kitchen ventilator field, in particular to a kind of kitchen ventilator exhaust nozzle pipe with noise interference device.
Background technique
It is chronically in the environment of high noisy, the hearing of people is often damaged, and can also be made in the environment of having noise for a long time
At user emotion problem.As people's quality of the life improves, people are also lower and lower to the tolerance of noise.Therefore kitchen ventilator
Noise reduction is also got more and more attention.
Kitchen ventilator noise reduction in the prior art is mostly the reduction that noise is realized by active noise reduction and passive noise reduction mode.
Active noise reduction mode can only act on noise of the frequency within 1000Hz, can only be by passive for the noise greater than 1000Hz
Noise reduction technology processing.However passive noise reduction is mainly by being wrapped in noise source or pipeline with acoustical cotton.But exist following several
A disadvantage: one, air pressure consume is excessive, and noise and fluid are needed across acoustical cotton, and sound can be consumed using friction, reach drop
The effect made an uproar, but air performance is reduced simultaneously.Two, it is difficult to select suitable acoustical cotton, seldom supplying factory can mention
For acoustical cotton can acoustic absorptivity at different frequencies data, therefore the manufacturing enterprise of kitchen ventilator can only continuously attempt to and mistake
In find out type or thickness of suitable acoustical cotton etc..Three, the noise reduction frequency of acoustical cotton is uncontrollable, for universal acoustical cotton
Maximum noise reduction effect cannot be reached under specified narrow frequency, different strategies can not be collocated with each other from design also to carry out more
Effective noise reduction.
Therefore in view of the shortcomings of the prior art, to provide a kind of kitchen ventilator exhaust nozzle pipe with noise interference device existing to solve
There is technical deficiency very necessary.
Summary of the invention
It provides it is an object of the present invention to avoiding in place of the deficiencies in the prior art a kind of with noise interference device
Kitchen ventilator exhaust nozzle pipe.The kitchen ventilator exhaust nozzle pipe with noise interference device can reduce specific multi-frequency noise.
Above-mentioned purpose of the invention is realized by following technical measures:
A kind of kitchen ventilator exhaust nozzle pipe with noise interference device is provided, is provided with for connecting blower and exhaust pipe
Exhaust nozzle pipe main body and noise interference device for reducing multi-frequency noise, noise interference device are assemblied in exhaust nozzle
Pipe main body.
Preferably, above-mentioned noise interference device is provided with the first aperture and the second aperture, the first aperture and the second aperture point
It is not connected to the air duct of exhaust nozzle pipe main body, and the first aperture is different with the horizontal position of the second aperture.
Preferably, the length of above-mentioned noise interference device is defined as La, and 0 < La≤1000mm。
Preferably, above-mentioned K1And K2The shortest distance be defined as Δ L, and La> Δ L > 5mm.
Preferably, above-mentioned noise interference device is by adjusting the area of the first aperture and the second aperture, noise interference device
Entire length or the shortest distance of the first aperture and the second aperture reach the noise reduction of specific multi-frequency noise.
First aperture is defined as K1, K1Area be defined as M1, the second aperture is defined as K2, K2Area be defined as M2,
The area of the air inlet in air duct is defined as K3, K3Area be defined as M3, the area of duct outlet is defined as K4, K4Area it is fixed
Justice is M4, and M1=M2, M3=M4。
Preferably, above-mentioned air duct and noise interference device communicating position are provided with first through hole.
Preferably, above-mentioned first through hole is provided with multiple.
Preferably, the shape of above-mentioned first through hole is circle, ellipse, triangle, square, rectangle, pentagon, six
At least one of side shape, diamond shape or irregular shape.
Preferably, the shape of the cross section of above-mentioned noise interference device be circle, ellipse, rectangle, triangle, diamond shape or
Arbitrary shape of the person in addition to above-mentioned shape.
Preferably, above-mentioned noise interference device is provided with multiple.
Preferably, above-mentioned exhaust nozzle pipe main body is provided with noise filtering device, and noise filtering device is assemblied in air duct
Inner surface.
Preferably, above-mentioned noise filtering device is set as being distributed with multiple for eliminating the second through-hole of multi-frequency noise
Panel.
Preferably, the aperture of above-mentioned second through-hole is defined as d, and d≤30mm.
Preferably, the edge minimum range of the edge of above-mentioned second through-hole and adjacent second through-hole is b, and b is appointing greater than 0
Meaning value.
Preferably, the value of above-mentioned d is multiple.
Preferably, the value of above-mentioned b is multiple.
Preferably, above-mentioned noise filtering device by adjusting different second through-holes aperture or the second through-hole edge with
The edge minimum range or noise filtering device of adjacent second through-hole reach specific unifrequency at a distance from exhaust nozzle pipe main body
The noise reduction of noise or multi-frequency noise.
Preferably, there are gaps between above-mentioned noise filtering device and the inner surface in air duct, are by the distance definition in gap
H1。
Preferably, above-mentioned exhaust nozzle pipe main body is additionally provided with sound-absorbing part, and sound-absorbing part fixing assembling is in gap.
Preferably, the thickness of above-mentioned sound-absorbing part is defined as H2, and H2≤0.6H1。
Preferably, above-mentioned sound-absorbing part is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam.
A kind of kitchen ventilator exhaust nozzle pipe with noise interference device of the invention, is provided with for connecting blower and exhaust
The exhaust nozzle pipe main body of pipe and noise interference device for reducing multi-frequency noise, noise interference device are assemblied in exhaust
Blast tube main body.The noise interference device is provided with the first aperture and the second aperture, the first aperture and the second aperture respectively with
The air duct of exhaust nozzle pipe main body is connected to, and the first aperture is different with the horizontal position of the second aperture.Noise interference dress of the present invention
It sets and is opened by adjusting the area of the first aperture and the second aperture, the entire length of noise interference device or the first aperture and second
The shortest distance in hole reaches the noise reduction of specific multi-frequency noise.The kitchen ventilator is able to maintain long-term good noise reduction effect, the noise
Interference device has the advantages that low cost, reliability are high.The noise interference device is the resonance amplitude through specific noise frequency
And the noise transmitted in phase, with wind channel tube is interfered to lower the amplitude of this noise frequency, is reached specific multi-frequency and is made an uproar
The noise reduction of sound is reduced.The material of the noise interference device is anticorrosive, resist chemical and is hardly damaged.
Detailed description of the invention
Using attached drawing, the present invention is further illustrated, but the content in attached drawing is not constituted to any limit of the invention
System.
Fig. 1 is a kind of kitchen ventilator exhaust nozzle pipe structural schematic diagram with noise interference device of embodiment 1.
Fig. 2 is the schematic cross-section of Fig. 1.
Fig. 3 is the length L of the noise interference device of Fig. 2aWith for K1And K2Shortest distance Δ L schematic diagram.
Fig. 4 is the schematic diagram of the shape of the cross section of noise interference device, and (1) in Fig. 4 is circle, and (2) in Fig. 4 are
Ellipse, (3) in Fig. 4 are rectangle, and (4) in Fig. 4 are triangle, and (5) in Fig. 4 are diamond shape, and (6) in Fig. 4 are any
Shape, (7) in Fig. 4 are arbitrary shape, and (8) in Fig. 4 are arbitrary shape.
Fig. 5 is a kind of kitchen ventilator exhaust nozzle pipe structural schematic diagram with noise interference device of embodiment 2.
Fig. 6 is a kind of kitchen ventilator exhaust nozzle pipe structural schematic diagram with noise interference device of embodiment 3.
Fig. 7 is a kind of kitchen ventilator exhaust nozzle pipe structural schematic diagram with noise interference device of embodiment 4.
Fig. 8 is the enlarged drawing in the region z in Fig. 7.
Fig. 9 is the structural schematic diagram of noise filtering device in Fig. 7.
Figure 10 is that the edge minimum range of the edge of the second through-hole aperture and the second through-hole and adjacent second through-hole is closed in Fig. 9
It is schematic diagram.
Fig. 1 includes into Figure 10:
Noise interference device 1,
Exhaust nozzle pipe main body 2, first through hole 21,
Noise filtering device 3, the second through-hole 31,
Sound-absorbing part 4,
Exhaust pipe 5.
Specific embodiment
Technical solution of the present invention is described further with the following Examples.
Embodiment 1.
A kind of kitchen ventilator exhaust nozzle pipe with noise interference device 1 is provided with for connecting blower as shown in Figures 1 to 4
With the exhaust nozzle pipe main body 2 of exhaust pipe 5 and for reducing the noise interference device 1 of multi-frequency noise, noise interference device 1
It is assemblied in exhaust nozzle pipe main body 2.
Noise interference device 1 is internally provided with the first aperture and the second aperture, the first aperture and the second opening respectively with
The air duct of exhaust nozzle pipe main body 2 is connected to, and the first aperture is different with the horizontal position of the second aperture.
First aperture is defined as K1, K1Area be defined as M1, the second aperture is defined as K2, K2Area be defined as M2,
The area of the air inlet in air duct is defined as K3, K3Area be defined as M3, the area of duct outlet is defined as K4, K4Area it is fixed
Justice is M4, and M1=M2, M3=M4.The air inlet of exhaust nozzle pipe of the present invention and blower (attached drawing is not shown) air outlet of kitchen ventilator
Connection, the air outlet of exhaust nozzle pipe are connect with exhaust pipe 5.
Of the invention can be with M1=M2, M3=M4, can also be with M1≠M2, M3≠M4.The M of the present embodiment1=M2, M3≠M4。M3
≠M4The advantages of be the structure that exhaust nozzle pipe can be made preferably to deacclimatize external kitchen ventilator.
Noise interference device 1 is long by adjusting the entirety of the area of the first aperture and the second aperture, noise interference device 1 of making an uproar
Degree or the shortest distance of the first aperture and the second aperture reach the noise reduction of specific multi-frequency noise.The length of noise interference device 1
Degree is defined as La, and 0 < La≤1000mm。K1And K2The shortest distance be defined as Δ L, and La> Δ L > 5mm.M1=M2, M3=
M4。
The cross section of noise interference device 1 of the invention it is conveniently of circular shape, or ellipse, rectangle, three
Angular, diamond shape or the arbitrary shape in addition to above-mentioned shape, the shape of specific cross section according to the actual situation depending on.
The cross section of noise interference device 1 of the invention is circle, as shown in (1) in Fig. 4.
The cross section of noise interference device 1 of the invention is ellipse, as shown in (2) in Fig. 4.
The cross section of noise interference device 1 of the invention is rectangle, as shown in (3) in Fig. 4.It should be noted that this hair
Rectangle in bright is not limited to this rectangle of (3) in Fig. 4, other rectangles also comply with the requirement of rectangle of the present invention, also at this
In the protection scope of invention.
The cross section of noise interference device 1 of the invention is triangle, as shown in (4) in Fig. 4.
The cross section of noise interference device 1 of the invention is diamond shape, as shown in (5) in Fig. 4.
The cross section of noise interference device 1 of the invention is arbitrary shape, such as (6) in Fig. 4, (7) in Fig. 4 and Fig. 4
In (8) shown in.It should be noted that the arbitrary shape in the present invention is not limited to (6) in Fig. 4, in (7) and Fig. 4 in Fig. 4
(8) this 3 kinds of rectangles, other arbitrary shapes also comply with the requirement of arbitrary shape of the present invention, also in protection scope of the present invention
It is interior.
The cross section of noise interference device 1 is round or ellipse etc. without angular shape, it is possible to reduce sound wave exists
The loss of the energy of noise interference device 1 to improve the effect with noise source sound wave interference, and then improves the effect of noise reduction.
The principle of the present invention are as follows: noise interference device 1 (Herschel-Quincke pipe) is according to the interference between sound wave
Achieve the effect that reduce sound.Noise interference device 1 be according between sound wave resonance and interference achieve the effect that reduce sound.
Because noise interference device 1 has multiple resonant frequencies: f0,1、f0,2、fs1And fs2.The broadband noise waves that kitchen ventilator generates exist
It is propagated in main air duct 2, when encountering noise interference device, broadband noise waves are divided into first via broadband noise waves and second and have a lot of social connections
Frequency noise wave, the continuation of first via broadband noise waves are propagated in main air duct 2；Second has a lot of social connections, and to enter noise dry for frequency noise wave
It relates to device 1 and resonates with noise interference device 1, and one of them from noise interference device is open out and imports main air duct
2.When the second frequency noise wave of having a lot of social connections has and f0,1、f0,2、fs1And fs2When same or similar frequency, the second frequency of having a lot of social connections is made an uproar
Sound wave enters noise interference device 1 and resonates with noise interference device 1, and one of them from noise interference device 1 is opened
Mouth, which comes out, imports main air duct.From the first via broadband noise waves that noise interference device 1 propagates from after importing main air duct 2 with
What main air duct 2 was propagated second has a lot of social connections frequency noise wave there are phase difference, and first via broadband noise waves and the second frequency of having a lot of social connections are made an uproar
Sound wave interferes to form interference broadband noise waves, and interference broadband noise waves subtract relative to the amplitude of broadband noise waves
Weak, noise reduces.
The length L of the basic frequency of 1 target noise reduction of noise interference device and velocity of sound c, noise interference device 1aAnd noise is dry
Relate to the K of device 11And K2Shortest distance Δ L functional dependence reciprocal, such as following formula:
Wherein f is the basic frequency of 1 target noise reduction of noise interference device, and F is function representation symbol.Expression in above formula
Are as follows:And N=(2p+1)/2, wherein N is subfrequency multiple, and p is arbitrary integer.
So the basic frequency of target noise reduction frequency is expressed as f0,1And f0,2, subfrequency fs1And fs2It can indicate
Are as follows:
fs1=[3f0,1,5f0,1,...........,xf0,1],
fs2=[2f0,2,3f0,2,...........,yf0,2],
Wherein ∞ >=x >=2m+1, m=1,2,3....., ∞, wherein ∞ >=y >=2, because, noise interference device of the present invention
1 can form two basic frequencies and multiple harmonic frequencies so as to mutually relate to multi-frequency noise, achieve the purpose that wideband noise reduction.
The kitchen ventilator exhaust nozzle pipe with noise interference device 1, is provided with exhaust nozzle pipe main body 2 and for reducing more
The noise interference device 1 of frequency noise, noise interference device 1 are assemblied in exhaust nozzle pipe main body 2；The noise interference device 1
It is provided with the first aperture and the second aperture, the first aperture and the second aperture are connected to the air duct of exhaust nozzle pipe main body 2 respectively, and
First aperture is different with the horizontal position of the second aperture.Noise interference device 1 of the present invention is opened by adjusting the first aperture and second
The shortest distance of the area in hole, the entire length of noise interference device 1 or the first aperture and the second aperture reaches specific multifrequency
The noise reduction of rate noise.The kitchen ventilator is able to maintain long-term good noise reduction effect, which has inexpensive, reliable
Spend high advantage.The noise interference device 1 is transmitted in resonance amplitude and phase, with wind channel tube through specific noise frequency
Noise, which is interfered, to be reached the noise reduction of specific multi-frequency noise to lower the amplitude of this noise frequency and is reduced.The noise
The material of interference device 1 is anticorrosive, resist chemical and is hardly damaged.
Embodiment 2.
A kind of kitchen ventilator exhaust nozzle pipe with noise interference device 1, as shown in figure 5, other features and 1 phase of embodiment
Together, the difference is that, the M of the present embodiment1=M2, M3=M4.It is logical that air duct and noise interference device communicating position are provided with first
Hole 21.First through hole 21 is provided with multiple.The shape of first through hole 21 of the invention is circle, ellipse, triangle, pros
At least one of shape, rectangle, pentagon, hexagon, diamond shape or irregular shape.The first of specific the present embodiment is logical
The shape in hole 21 is round and ellipse.The circle and ellipse first through hole 21 of the present embodiment make above opposite hold in technique
Easily, and because of the interference of not no corner angle.
It should be noted that the shape of first through hole 21 may be triangle, rectangle, square, pentagon, hexagon,
Diamond shape or irregular shape, or the combination of the shape of above-mentioned a variety of first through hole 21, specific embodiment is with reality
Depending on the situation of border.
The caliber of the noise reduction effect of noise interference device 1 and air duct and noise interference device 1 has great relationship.The present invention
Preferably M1=M2, M3=M4, can also be with M1≠M2, M3≠M4.Since in identical cross-sectional area, i.e. M3=M4When, in M2Lower section
Even if region can reach resonance phase that good noise reduction effect is formed in noise interference device 1 and amplitude some deviations,
With this condition, broadband noise frequency can be effectively reduced in this.
In M3>M4When, in M2The noise reduction effect in the region of lower section is confined to specific narrow frequency noise, and noise reduction effect can poor one
A bit.This is because as long as acoustic phase and amplitude that noise interference device 1 resonates have slight deviations that will damage to the transmitting of sound wave
Mistake has significant change.In equal cross-sectional area M3=M4Under equal proportion, the slippages of noise interference device 1 are Δ L/La
Function.
Embodiment 3.
A kind of kitchen ventilator exhaust nozzle pipe with noise interference device 1, as shown in fig. 6, other features and 1 phase of embodiment
Together, the difference is that, the noise interference device 1 of the present embodiment is provided with multiple.It is dry that the present embodiment is specifically provided with 4 noises
Relate to device 1.
It should be noted that noise interference device 1 of the invention can be set to 4, may be set to be any greater than 1
Positive integer, specific item number according to the actual situation depending on.
Compared with Example 1, the parameter of multiple noise interference devices 1 of the present embodiment can be the same or different.
The noise interference device 1 for the parameter that difference is, the specific different f of the basic frequency of different noise interference devices 10,1And f0,2, because
This can reduce the noise of more broadband.For the noise interference device 1 with identical parameters, the drop of identical frequency can be improved
It makes an uproar effect.Noise reduction effect can be improved in multiple noise interference devices 1.
Embodiment 4.
A kind of kitchen ventilator exhaust nozzle pipe with noise interference device 1, as shown in Fig. 7 to 10, other features and embodiment 1
It is identical, the difference is that, exhaust nozzle pipe main body 2 of the invention is provided with noise filtering device 3, and noise filtering device 3 fills
Inner surface assigned in air duct.
Noise filtering device 3 is set as being distributed with multiple for eliminating the panel of the second through-hole 31 of multi-frequency noise.
The aperture of second through-hole 31 is defined as d, and d≤30mm.The value of d is multiple.
The edge minimum range of the edge of second through-hole 31 and adjacent second through-hole 31 is b, and b is the arbitrary value greater than 0.b
Value be it is multiple.
In the constant situation of aperture d, the value of the edge minimum range b of the edge of the second through-hole 31 and adjacent second through-hole 31
The target noise frequency of smaller elimination is bigger.In the edge of the second through-hole 31 and the edge minimum range of adjacent second through-hole 31
In the constant situation of b, the smaller target noise frequency to be eliminated of the value of aperture d is with regard to smaller.
It should be noted that when the value of value and d for b is unique, it can be to specific unifrequency noise noise reduction.But work as b
It can be according to the two value with being combined into specific unifrequency noise or multi-frequency noise noise reduction when with d being multiple and different values.B's
Value and the number of value of d, size according to the actual situation depending on.
The present invention is by adjusting the aperture of different second through-holes 31 or the edge and adjacent second through-hole of the second through-hole 31
31 edge minimum range or noise filtering device 3 reach at a distance from exhaust nozzle pipe main body 2 specific unifrequency noise or
The noise reduction of multi-frequency noise.
There are gaps between noise filtering device 3 of the invention and the inner surface in air duct, are H by the distance definition in gap1。
Exhaust nozzle pipe main body 2 is additionally provided with sound-absorbing part 4, and 4 fixing assembling of sound-absorbing part is in gap.The thickness of sound-absorbing part 4 is defined as H2, and
H2≤0.6H1.Sound-absorbing part 4 is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam.
Denoising device principle of the invention: noise filtering device 3 can be propagated in limited closed space in noise source
When to noise filtering device 3, noise reduction is carried out.Sound wave is usually propagated with opposite direction touching noise filtering device 3, so big portion
The incidence wave divided can be interfered with back wave.In the fixed distance of the characteristic about a quarter of noise source wavelength away from being at degree
H1, the speed of particle reaches highest, because the present invention by noise filtering device 3 and the inner wall of exhaust nozzle pipe main body 2 away from
From a quarter in noise source wavelength away from degree at, the noise of the wavelength can be effectively eliminated.
The density and material of sound-absorbing part 4 also have an important influence, sound wave can directly through the sound-absorbing part 4 of extremely-low density,
The frictional wear of sound energy can not be increased；Under high density, noise sound wave then can be reflected away directly, can not enter noise mistake
Filter the second through-hole 31 of device 3.Therefore sound-absorbing part 4 of the invention is preferably fiber, PP cotton, polyester fiber, Carbon fibe or more
Hole foam.
The determinant of the resonant frequency of noise filtering device 3 of the invention: the aperture of the second through-hole 31, the second through-hole 31
Edge and adjacent second through-hole 31 edge minimum range or noise filtering device 3 and exhaust nozzle pipe main body 2 at a distance from
It whether is independent space inside noise filtering device 3 with the second through-hole 31, just can determine that the resonance frequency of noise filtering device 3
Rate achievees the purpose that reduce specific frequency.
The present embodiment increases noise filtering device 3 and sound-absorbing part 4 compared with embodiment, and main purpose is target noise frequency to be allowed
The energy of rate can be filtered or be absorbed by noise filtering device 3 and sound-absorbing part 4 before not entering noise interference device 1 also, remaining
Noise penetrate again noise interference device 1 elimination, to reach maximum noise reduction effect.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should be managed
Solution, can be with modifying or equivalently replacing the technical solution of the present invention, without departing from the essence and model of technical solution of the present invention
It encloses.
Claims (10)
1. a kind of kitchen ventilator exhaust nozzle pipe with noise interference device, it is characterised in that: it is provided with for connecting blower and row
The exhaust nozzle pipe main body of tracheae and noise interference device for reducing multi-frequency noise, noise interference device are assemblied in row
Gas jets pipe main body；
The noise interference device is provided with the first aperture and the second aperture, the first aperture and the second aperture respectively with exhaust nozzle
The air duct of pipe main body is connected to, and the first aperture is different with the horizontal position of the second aperture.
2. the kitchen ventilator exhaust nozzle pipe according to claim 1 with noise interference device, it is characterised in that: the noise
The length of interference device is defined as La, and 0 < La≤1000mm。
3. the kitchen ventilator exhaust nozzle pipe according to claim 2 with noise interference device, it is characterised in that: the K1With
K2The shortest distance be defined as Δ L, and La> Δ L > 5mm.
4. the kitchen ventilator exhaust nozzle pipe according to claim 3 with noise interference device, it is characterised in that: the noise
Interference device by adjusting the area of the first aperture and the second aperture, the entire length of noise interference device or the first aperture and
The shortest distance of second aperture reaches the noise reduction of specific multi-frequency noise.
5. the kitchen ventilator exhaust nozzle pipe according to claim 4 with noise interference device, it is characterised in that: first is opened
Hole is defined as K1, K1Area be defined as M1, the second aperture is defined as K2, K2Area be defined as M2, the face of the air inlet in air duct
Product is defined as K3, K3Area be defined as M3, the area of duct outlet is defined as K4, K4Area be defined as M4, and M1=M2,
M3=M4；
The air duct and noise interference device communicating position are provided with first through hole；
The first through hole is provided with multiple；
The shape of the first through hole be circle, ellipse, triangle, square, rectangle, pentagon, hexagon, diamond shape or
At least one of person's irregular shape.
6. the kitchen ventilator exhaust nozzle pipe according to claim 4 or 5 with noise interference device, it is characterised in that: it is described
The shape of the cross section of noise interference device is for circle, ellipse, rectangle, triangle, diamond shape or in addition to above-mentioned shape
Arbitrary shape.
7. the kitchen ventilator exhaust nozzle pipe according to claim 2 to 6 any one with noise interference device, feature exist
In: the noise interference device is provided with multiple.
8. the kitchen ventilator exhaust nozzle pipe according to claim 7 with noise interference device, it is characterised in that: the exhaust
Blast tube main body is provided with noise filtering device, and noise filtering device is assemblied in the inner surface in air duct；
The noise filtering device is set as being distributed with multiple for eliminating the panel of the second through-hole of multi-frequency noise.
9. the kitchen ventilator exhaust nozzle pipe according to claim 8 with noise interference device, it is characterised in that: described second
The aperture of through-hole is defined as d, and d≤30mm；
The edge minimum range of the edge of second through-hole and adjacent second through-hole is b, and b is the arbitrary value greater than 0；
The value of the d is multiple；
The value of the b is multiple；
The noise filtering device is logical by adjusting the aperture of different second through-holes or the edge of the second through-hole and adjacent second
The edge minimum range or noise filtering device in hole reach specific unifrequency noise or more at a distance from exhaust nozzle pipe main body
The noise reduction of frequency noise.
10. the kitchen ventilator exhaust nozzle pipe according to claim 9 with noise interference device, it is characterised in that: it is described to make an uproar
There are gaps between sound filter device and the inner surface in air duct, are H by the distance definition in gap1；
The exhaust nozzle pipe main body is additionally provided with sound-absorbing part, and sound-absorbing part fixing assembling is in gap；
The thickness of the sound-absorbing part is defined as H2, and H2≤0.6H1；
The sound-absorbing part is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811420934.5A CN109373398A (en) | 2018-11-27 | 2018-11-27 | A kind of kitchen ventilator exhaust nozzle pipe with noise interference device |
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| CN201811420934.5A CN109373398A (en) | 2018-11-27 | 2018-11-27 | A kind of kitchen ventilator exhaust nozzle pipe with noise interference device |
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